[jm951]

Even original Trapdoor Springfields can be fired with modern factory ammo. The modern stuff is loaded to the original pressures of black powder. The main difference will be in the depth of the rifling. The old rifles were made for soft lead bullets and the moderns ones are jacketed. This can lead to inaccuracy in the original rifles. With inspection by a competent gunsmith as for safety and collectibility, your rifle is probably safe to fire with factory ammo. Don't try to shoot the stuff I've loaded in it as it was tweaked for Ruger No 1. rifles. Very high pressure and will wreck a Trapdoor.